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Frequently Asked Questions

Vertical Electrical Sounding is one of the very common geophysical methods used for domestic borewell exploration. However, sufficient open area around the location is needed for conducting the survey. Other methods of geophysical survey are used in special cases, and they are quite expensive.

Local well diviners who use wooden sticks or magnetic blocks are also to some extent successful in identifying borewell sites. But this method may not be always reliable, especially in areas where the geological formation is critical.

As such there is no prescribed season for drilling a borewell if the location of site has adequate ground water potential. However, identifying a suitable site and drilling the borewell in summer months would give the worst possible scenario in the location at the point of time. Therefore, summer months are usually preferred by some experts as the best suited period for drilling a new borewell. Also, as most agricultural sites can be accessed by drilling rigs only during summer months, they are usually available in these periods.

Methods of drilling to be adopted depends on factors like suitability of a method for a particular type of geological formation (i.e., such as alluvial, boulder and hard rock), cost factors, diameter and depth of borewell and the purpose intended. Most commonly used types of drilling methods are;

  • Water Jetting - Shallow bores in alluvial formations
  • Augur Drilling - Shallow bores in alluvial formations
  • Calyx Drilling - Shallow borewells in both hard rock and alluvial formation
  • Percussion Drilling – Deep bores in boulder formation
  • Rotary Drilling - Most common method used for drilling large and deep bores in alluvial formations.
  • Down the Hole Hammering (DTH) Drilling – Most common method for drilling large and deep borewells in hard rock formations
  • For domestic purposes, 4.5 and 6 inches dia borewells are usually drilled. While 4.5 inch is most commonly drilled borewells for domestic purposes, 6-inch borewells are drilled when higher yield is required for large apartments or buildings and also for agricultural purposes. Initially larger diameter bits are used to place the casing pipes up to the hard rock zone prior to drilling specified size of the borewell.

    Charges for drilling a specified size of borewell include

  • drilling cost per feet,
  • cost of casing pipe per feet,
  • cost of drilling and installation charge for casing pipe per feet,
  • flushing charges per hour for flushing the borewell after drilling and
  • transportation charges of the rig to the site from nearest town per km.
  • Drilling rates are sometimes charged in slabs for specified ranges especially when deep borewells are drilled. As drilling rates usually vary depending on the availability of rigs, local demand, and site conditions. Please reach out to us to Get a Quote